Selecting the correct thermometer for an application
is by definition very important, to achieve the
maximum accuracy and repeatability of the
temperature reading. The selection criteria
for a digital thermometer should include:

Our digital thermometers utilise one of three types of
temperature sensors: thermocouple, NTC thermistor
and resistance temperature detectors (PT100 or RTD).
Thermocouple thermometers and probes are fast to
respond to changes in temperature, they also have a
wide measurement range. Resistance temperature
detector and NTC thermistor thermometers and
probes are slower to respond to changes in
temperature, but generally more accurate, although
thermistor probes have a limited measurement range.
-200

0

200

400

600

800

NTC
PT100 OR RTD
THERMOCOUPLE TYPE T
THERMOCOUPLE TYPE K

60

1000

1200 째C

NTC THERMISTORS
NTC thermistor probes are also based on a
temperature dependent resistance change in the
sensor element. But unlike resistance thermometer
detectors, thermistors have a negative temperature
coefficient, i.e the resistance decreases with
increasing temperature.

RESISTANCE TEMPERATURE DETECTORS
Resistance temperature detector (PT100 or RTD)
probes consist of a flat film or wire wound platinum
resistance sensor element. The measurement
resistance value changes in line with the
temperature being measured.

THERMOCOUPLES
Thermocouple probes consist of two wires of
dissimilar metals or metal alloys welded together.
Thermocouples are based on the thermoelectric
(Seebeck) effect. There are various types of
thermocouple, types K and T being the most
common, although type K is by far the most
widely used.

The Therma 1 and 3 digital thermometers are rugged and easy to use
instruments that operate through the range of -100 to 1372 °C with a
0.1 °C or 1 °C resolution. The thermometers are housed in a robust
ABS case that contains Biomaster Antimicrobial Technology to
reduce bacterial growth.
The Therma 1 and 3 feature large, easy to read, LCD displays with open
circuit 'Err', hold and low battery indication. Each thermometer is
powered by three AAA batteries that give a minimum of 10000 hours
battery life. The units will power off automatically after ten minutes,
maximising battery life. This feature can be disabled by the user,
if not required.
We offer an extensive range of interchangeable type K thermocouple
probes for a variety of different applications, see pages 75 to 81 for
full details.
Penetration probe (123-160)

INDUSTRIAL

Therma Elite thermometer
The Therma Elite incorporates all the features
of a Therma 1 thermometer, but with the addition
of a backlit display, max/min memory function
and a mode button for the selection of 0.1/1 °C/°F.
The thermometer also incorporates a calibration
trim function (±2 °C) which allows the user to
compensate for thermocouple probe errors.

OPTIONAL ACCESSORIES:

Protective silicone boot - the Therma series is
splashproof to IP64 when used in conjunction
with this boot. Various colours are available - see
page 13 for details
Stainless steel wall bracket (screws not supplied)
& protective black silicone boot (832-053)

The Therma Waterproof thermometer is housed in a robust
waterproof black ABS case which offers IP66/67 protection.
The thermometer utilises state of the art electronic circuitry,
designed for reliability and ease of use and can be
submerged or washed under a running tap - ideal
for industrial applications.
The thermometer measures temperature over the range of
-99.9 to 299.9 °C with a 0.1 °C resolution, auto-ranging to 1 °C
resolution over the range of 300 to 1372 °C.

INDUSTRIAL

The Therma Waterproof thermometer features a large easy
to read, LCD display with max/min, hold, open circuit,
low battery indication and a user selectable backlight.
The unit also incorporates an auto-power off facility that
automatically turns the instrument off after ten minutes,
maximising battery life.
Each unit is housed in a durable, ABS case that incorporates
an integrated rubber seal to ensure complete water
tightness and help reduce the possibility of damage
in harsh environments.
We offer an extensive range of interchangeable type K
thermocouple probes, for a variety of different applications,
see pages 75 to 81 for full details.
Waterproof penetration
probe (143-162)

LEGIONNAIRES' THERMOMETER KITS
For routine water temperature monitoring
New budget kit available for 2019

Incorrect water temperature is a key risk factor for legionella growth. The legionella bacteria multiply in water
at temperatures between 20 to 45 째C. A typical method of control is to store hot water above 60 째C and
distribute it at above 50 째C (care must be taken to prevent scalding). Cold water should be kept below 20 째C.
These kits represent excellent value-for-money and are supplied in a robust ABS carrying case/zip pouch.
For a full specification on the Therma 1, see page 61.

LEGAL RESPONSIBILITIES FOR TESTING FOR LEGIONELLA
If you are the employer or person in control of premises, you must organise a risk assessment from
exposure to legionella. The revised Approved Code of Practice (ACOP) Legionnaires' disease: Control of
Legionella Bacteria in water systems (L8) issued by the Government's Health and Safety Executive (HSE)
significantly extends the scope of its guidance on control of legionella bacteria in water. The code applies
to all hot and cold water systems in the workplace regardless of their capacity, i.e. the lower limit of 300
litres previously used to exclude domestic systems, no longer applies. Whilst domestic systems may
represent a risk, the code only applies to a risk arising from a work activity, but does include domestic
landlords who have a duty to keep their tenants safe from health hazards. This means that all employers
and landlords, who manage premises with hot/cold water systems and/or wet cooling systems, have a
legal responsibility to identify any risk of contamination and to prevent or control it.

The Therma Differential is a digital thermometer that
allows the user to operate two type K thermocouple probes
simultaneously. The display can be switched to show probe
T1 or T2 temperature or the difference between probes T1
and T2 (T1-T2). This allows, for example, the temperature
drop across radiators or the temperature rise or fall of two
items being measured.

INDUSTRIAL

The Therma Differential measures temperature over the
range of -99.9 to 299.9 °C with a 0.1 °C resolution or 300 to
1372 °C with a 1 °C resolution. The thermometer features
a custom, LCD display with °C/°F, T1, T2, diff, hold, open
circuit, low battery indication and a user selectable
backlight. The unit incorporates an auto-power off facility
that automatically turns the instrument off after ten
minutes, maximising battery life.
Each unit is housed in a durable, ABS case that has
an integrated rubber seal to ensure complete water
tightness and help reduce the possibility of damage
in harsh environments.
We offer an extensive range of interchangeable type K
thermocouple probes, for a variety of different applications,
see pages 75 to 81 for full details.

These HVAC thermometer kits are ideal for a wide range of plumbing and heating applications. The kits can
be used to monitor both cold and hot water temperatures as well as undertake other routine HVAC checks.
A typical application includes balancing radiators using a pair of clip-on pipe probes on the flow and return
pipes at either end of the radiator. Starting with the radiator nearest the boiler, adjust the lockshield valve
until you get a temperature drop of 11 °C across the two pipes. Then move on to the other radiators in turn.
For a full specification on the Therma Differential thermometer, see page opposite.

LEGAL RESPONSIBILITIES FOR SAFE SURFACE & WATER TEMPERATURES
If you are the employer or person in control of premises you have a legal duty of care in respect of the risk
of scalding or burning from hot water and hot surface temperatures. NHS and HSE guidelines state that
surface temperatures of space heating devices such as thermal storage heaters, oil-filled radiators and
conventional radiators should not exceed 43 °C. This will control and prevent patients from being burned.
When the surface temperature exceeds 43 °C there is a high risk of burning, often leading to fatalities in
the elderly, people with mental illness and learning disabilities or children who cannot react appropriately
to prevent injury.

The MicroTherma 1 microprocessor thermometer measures
temperature over the range of -270 to 1768 °C with a 0.1 °C/°F
resolution. Each MicroTherma 1 incorporates an easy to read,
4½-digit dual LCD display with open circuit, low battery, hold,
max/min and °C/°F indication.
The thermometer should never need re-calibrating as the
microprocessor enables the instrument to continuously
and automatically carry out self-diagnostic re-calibration.
An additional feature allows the user to adjust the reading
(±2.5 °C) to offset any probe errors, correcting
any inaccuracies of the thermocouple probe.

INDUSTRIAL

Each thermometer thereafter will
automatically store, display the offset
and adjust the instrument for the known
probe error, maximising system accuracy.

High temperature
probe (123-212)

The MicroTherma 1 has the versatility of accepting any type K, J, T, R, N, S & E thermocouple probe, the probe
type is simply selected through the mode button. The unit incorporates both max and min readings with
a reset function and also features an auto-power off facility that maximises the battery life, turning the
instrument off automatically after 30 minutes, this function can be disabled by the user, if not required.
Other selectable parameters include: display contrast and internal CJC temperature reading. For details
of the wide range of type K or type T thermocouple probes available, see pages 75 to 81.

The Therma 1T utilises a type T thermocouple sensor
which offers both fast response and a measurement
range of -100 to 400 °C with a 0.1 °C resolution. Each
unit is housed in a robust ABS case that contains
Biomaster Antimicrobial Technology that reduces
bacterial growth.
The Therma 1T thermometer features a large, easy
to read, LCD display with open circuit and low battery
indication. Each unit is powered by three AAA
batteries that give a minimum of 10000 hours
battery life. The instrument will power off
automatically after ten minutes, maximising
battery life. This feature can be disabled by
the user, if not required.
Below is a small selection of our high accuracy (±0.2 °C)
type T thermocouple probes, for alternative probes
contact our sales team or visit our website.
AUTO
OFF

High accuracy is one of the notable features of the
Precision thermometers. There are two models available,
the Precision and Precision Plus. The Precision measures
temperature over the range of -199.9 to 499.9 °C with a
0.1 °C resolution and high accuracy of ±0.2 °C. The Precision
Plus measures temperature over the range of -199.99 to
199.99 °C with a 0.01 °C resolution and high accuracy of
±0.05 °C. Please note: the accuracies quoted are for the
instruments only.

INDUSTRIAL

Conveniently located on the front of the instrument are
the on/off, max/min and display hold buttons. The Binder
probe socket is positioned at the top of the instrument
which enables a variety of probes to be used depending
on the application.
The Precision thermometers feature a large, easy to read,
LCD display with open circuit 'Err' and low battery indication.
Each thermometer is powered by three AAA batteries that
give a minimum of 2000 hours battery life. The unit will power
off automatically after ten minutes, maximising battery life.
This feature can be disabled by the user, if required.
We offer a range of interchangeable PT100 Class A probes for use with
the Precision thermometer, see page 83 for full details. The Precision Plus
is supplied with a PT100 1/10 th DIN liquid probe (160-222) and a UKAS
Certificate of Calibration. For regularly checking the accuracy of each
Precision thermometer, a range of calibration PT100 test caps complete
with a UKAS Certificate of Calibration are available, see page 103 for details.

PT100 1/10th DIN liquid
probe (160-222)

OPTIONAL ACCESSORY:

0601

Protective silicone boot - the Precision/Precision Plus
thermometers are splashproof to IP64 when used
in conjunction with this boot. Various colours are
available - see page 13
HOLD

These industrial Thermapen thermometers incorporate
a large digital display with a precise read-out over the
range of -49.9 to 299.9 °C with a 0.1 °C resolution and an
accuracy of ±0.4 °C. The resolution can be switched to
1 °C, if required, via a switch in the battery compartment.
The thermometer will power off automatically after
ten minutes, maximising battery life. This feature can
be disabled if not required. Both low battery (icon)
and open circuit indication are also displayed, when
applicable. Each industrial Thermapen is powered by
two lithium coin cell batteries with a minimum
life expectancy of 1500 hours.

WATERPROOF
SURFACE PROBE
Ø8 x 95 mm

This waterproof ribbon sur face
probe is ideal for measuring the
sur face temperature of pipes,
bearings, hotplates and other
flat sur faces.

The probe conveniently folds back through 180° into
the side of the instrument when not in use. The casing
is washable and includes Biomaster Antimicrobial
Technology that reduces bacteria growth and the
ergonomic rubber seal minimises the risk of the
ingress of water, dust or food.
Choice of probe styles
The industrial Thermapen is available with three styles
of probe; surface, air or penetration. The fast response
air probe is an invaluable tool in establishing the correct
air temperature quickly in HVAC and laboratory
applications. The surface probe is particularly useful
in determining the temperature of hot plates or pipes
etc. Please note: the accuracy and speed of response
will be dependant on whether the surface is flat and
heat transfer compound is used.

INDUSTRIAL

PENETRATION
PROBE
Ø3.3 x 108 mm

This strong and versatile probe
incorporates a pointed, general
purpose tip, ideal for insertion
into liquids and semi-solids.

AIR OR GAS
PROBE

OPTIONAL ACCESSORIES:

Ø3.3 x 95 mm

Protective PVC wallet with belt strap (830-110)

Protective silicone boot (830-260)

Glow-in-the-dark silicone boot with magnets (830-265)

Stainless steel wall bracket (832-002) screws not supplied

This fast response air or gas probe
is ideal for measuring the air
temperature in HVAC applications,
laboratories and other temperature
sensitive working areas.
AUTO
OFF

These pocket-sized Ø25 mm dial thermometers
feature a magnified lens and a pointed Ø4 x 130 mm
stainless steel stem. Each dial is manufactured in
three scales and is supplied with a FREE calibration
spanner and probe cover complete with pocket clip.

These pocket-sized Ø45 mm dial thermometers
feature a pointed Ø4 x 130 mm stainless steel stem.
Each dial is manufactured in three scales and is
supplied with a FREE calibration spanner and
probe cover complete with pocket clip.

The thermometer incorporates a calibration
adjustment nut, at the rear of the dial to allow
easy re-calibration.

The thermometer incorporates a calibration
adjustment nut, at the rear of the dial to allow
easy re-calibration.

This easy to use surface pipe thermometer features
a Ø60 mm stainless steel dial and indicates
temperature over the range of 0 to 120 °C or
32 to 250 °F. The Ø50 mm dial face has a clear,
graduated scale indicating temperature in 2 °C
and 4 °F divisions.

This easy to use surface pipe thermometer
features a Ø60 mm nickel plated dial and indicates
temperature over the range of 0 to 120 °C. The
Ø50 mm dial face has a clear, graduated scale
indicating temperature in 2 °C divisions.

Order code Description
800-951
Pipe thermometer

Each pipe surface thermometer is supplied with
a wrap-around spring kit (53 mm long) for pipe
mounting. For larger pipes it is possible to attach
the thermometer to pipework using either
tie-wraps or wire (not supplied).

INDUSTRIAL

Supplied with a wrap-around stainless steel
spring kit for pipe mounting (two springs - one
for up to 15 mm pipes, the other for up to 53 mm
pipes). For larger pipes it is possible to attach the
thermometer to pipework using either tie-wraps
or wire (not supplied).

Order code Description
800-971
Budget pipe thermometer

MAGNETIC BI-METAL DIAL THERMOMETER
Ø60 mm bi-metal dial
Ideal for central heating & HVAC industries
This Ø60 mm stainless steel, surface dial
thermometer incorporates a magnetic sensing
pad for mounting on ferrous metals and indicates
temperature ranges from 0 to 120 °C or 32 to 250 °F.
This magnetic dial thermometer is widely used in
the central heating and HVAC industries and is
suitable for monitoring the temperature of radiators
and pipes, it is especially useful when balancing
radiator temperatures.
The Ø50 mm dial face has a clear, graduated scale
indicating temperature in 2 °C and 4 °F divisions.

MAX/MIN THERMOMETER
Simultaneously displays max/min temperatures
Large, easy to read LCD display
These digital max/min thermometers with internal
temperature sensor simultaneously display the
actual temperature whilst displaying the maximum
and minimum recorded temperatures.
Each unit measures temperature over the range
of -20 to 69.9 °C with a 0.1 °C/°F resolution and
is ideal for recording temperatures in an office,
factory, laboratory, home, greenhouse or conservatory.
The thermometer is easy to use, to switch the
current reading between °C and °F or reset the
recorded max/min temperatures simply press
the button on the side of the unit.
The unit is housed in an ABS case measuring 29 x
79 x 187 mm that incorporates a slot for hanging
and is powered by one AA battery (supplied).

MAX/MIN THERMOMETER
Internal sensor & external temperature probe
Programmable high/low audible alarm
This max/min and alarm thermometer indicates
temperature over the range of -24.9 to 69.9 °C with
a resolution of 0.1 °C/°F and an accuracy of ±1 °C.
The thermometer features a large, easy to read
LCD display, max/min memory function to record
the highest and lowest temperatures and a high/
low programmable audible alarm. The unit
incorporates two temperature sensors, a remote
water resistant probe with one metre PVC lead for
the appliance temperature and an internal sensor
for the room temperature.
The remote probe can be mounted onto a wall
using the suction pad or mounting bracket
supplied. Housed in a durable ABS case the
thermometer incorporates a foot-stand for
shelf mounting.

MAX/MIN THERMOMETER
Classic design with a modern digital LCD bar graph
Internal temperature sensor
This max/min thermometer simultaneously
displays the actual temperature whilst displaying
the max and min temperatures on a digital
LCD bar graph.
The thermometer measures temperature over the
range of -40 to 40 °C with a resolution of 0.1 °C/°F
and an accuracy of ±1 °C. To switch the current
reading between °C and °F, simply press the
button on the side of the unit. To reset the
recorded max and min temperatures, simply
press the red 'clear' button on the front of the
thermometer.
The instrument is housed in an ABS case which
incorporates a slot for hanging and is powered
by one AA battery (supplied).